EP0061011B1 - Verfahren zur Herstellung von Entschwefelungsmitteln für Roheisen- oder Stahlschmelzen - Google Patents

Verfahren zur Herstellung von Entschwefelungsmitteln für Roheisen- oder Stahlschmelzen Download PDF

Info

Publication number: EP0061011B1
Authority: EP; European Patent Office
Prior art keywords: mixture; weight; calcium oxide; calcium; cao
Prior art date: 1981-03-24
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Expired

Application number

EP82101427A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP0061011A1 (de

Inventor

Albert Braun

Willi Dr. Portz

Georg Dr. Strauss

Hans-Martin Dipl.-Ing. Delhey

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Krupp Stahl AG

Hoechst AG

Original Assignee

Krupp Stahl AG

Hoechst AG

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1981-03-24

Filing date

1982-02-25

Publication date

1984-09-26

1982-02-25 Application filed by Krupp Stahl AG, Hoechst AG filed Critical Krupp Stahl AG

1982-02-25 Priority to AT82101427T priority Critical patent/ATE9596T1/de

1982-09-29 Publication of EP0061011A1 publication Critical patent/EP0061011A1/de

1984-09-26 Application granted granted Critical

1984-09-26 Publication of EP0061011B1 publication Critical patent/EP0061011B1/de

Status Expired legal-status Critical Current

Links

238000000034 method Methods 0.000 title claims abstract description 13
239000003795 chemical substances by application Substances 0.000 title claims abstract description 11
230000003009 desulfurizing effect Effects 0.000 title claims abstract description 6
239000000161 steel melt Substances 0.000 title claims abstract description 6
229910000805 Pig iron Inorganic materials 0.000 title description 6
ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 58
239000000292 calcium oxide Substances 0.000 claims abstract description 40
239000000203 mixture Substances 0.000 claims abstract description 30
239000005997 Calcium carbide Substances 0.000 claims abstract description 12
BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 12
CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims abstract description 12
235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 11
235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 11
239000004571 lime Substances 0.000 claims abstract description 11
239000000571 coke Substances 0.000 claims abstract description 10
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 8
OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
229910052799 carbon Inorganic materials 0.000 claims abstract description 8
XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
239000007795 chemical reaction product Substances 0.000 claims abstract description 6
238000004519 manufacturing process Methods 0.000 claims abstract description 6
239000002245 particle Substances 0.000 claims abstract description 6
BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 4
229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
229910052742 iron Inorganic materials 0.000 claims abstract description 3
239000011575 calcium Substances 0.000 claims description 9
OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 6
229910052791 calcium Inorganic materials 0.000 claims description 6
DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
150000004649 carbonic acid derivatives Chemical class 0.000 claims description 2
239000011777 magnesium Substances 0.000 claims description 2
229910052749 magnesium Inorganic materials 0.000 claims description 2
229910052708 sodium Inorganic materials 0.000 claims description 2
239000011734 sodium Substances 0.000 claims description 2
239000012467 final product Substances 0.000 claims 2
238000013019 agitation Methods 0.000 claims 1
235000012255 calcium oxide Nutrition 0.000 description 26
238000006477 desulfuration reaction Methods 0.000 description 8
230000023556 desulfurization Effects 0.000 description 8
239000012803 melt mixture Substances 0.000 description 4
239000000047 product Substances 0.000 description 4
235000019738 Limestone Nutrition 0.000 description 3
239000006028 limestone Substances 0.000 description 3
239000000155 melt Substances 0.000 description 3
239000000126 substance Substances 0.000 description 3
VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
238000006243 chemical reaction Methods 0.000 description 2
239000007789 gas Substances 0.000 description 2
229910052751 metal Inorganic materials 0.000 description 2
239000002184 metal Substances 0.000 description 2
238000010079 rubber tapping Methods 0.000 description 2
NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
SBLCGFVUYJGJIS-UHFFFAOYSA-N [O-2].[Ca+2].[C+4].[O-2].[O-2] Chemical compound [O-2].[Ca+2].[C+4].[O-2].[O-2] SBLCGFVUYJGJIS-UHFFFAOYSA-N 0.000 description 1
239000000654 additive Substances 0.000 description 1
239000000853 adhesive Substances 0.000 description 1
230000001070 adhesive effect Effects 0.000 description 1
229910000019 calcium carbonate Inorganic materials 0.000 description 1
239000006229 carbon black Substances 0.000 description 1
239000013078 crystal Substances 0.000 description 1
230000000694 effects Effects 0.000 description 1
239000010436 fluorite Substances 0.000 description 1
239000007788 liquid Substances 0.000 description 1
150000002739 metals Chemical class 0.000 description 1
238000007711 solidification Methods 0.000 description 1
230000008023 solidification Effects 0.000 description 1
239000011593 sulfur Substances 0.000 description 1
229910052717 sulfur Inorganic materials 0.000 description 1

Classifications

- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising

Definitions

the present invention relates to a process for the production of desulfurization agents based on calcium oxide-containing calcium carbide for pig iron and steel melts, a calcium carbide-calcium oxide melt mixture having a CaO content of 20 to 80% by weight first being produced from lime and coke, which is allowed to solidify into a block by allowing it to cool; then, while the solidified block still has an average temperature of more than 400 ° C., it is broken down to grain sizes of less than 150 mm and calcium oxide is added to the comminuted mixture, which is still at least 400 ° C., in accordance with the CaO content desired in the end product, and the mixture is then ground with vigorous mixing to grain sizes of less than 10 mm.
a method is already known from EP-A2-19 086.
DE-C3-2 037 758 describes a process for the production of calcium carbide for the desulfurization of molten metals by introducing quicklime (CaO) and fluorspar into molten calcium carbide.
the additives are used with a content of adhesive and crystal water less than 5% by weight.
the burnt lime can be partially replaced by a gas-releasing substance such as limestone, which increases the porosity of the carbide and thus the active surface offered during the desulfurization.
Coke breeze can also be added to the carbide.
DE-C3-22 36160 describes an agent for the desulfurization of liquid pig iron based on calcium oxide, the reactive calcium oxide carbon, e.g. B. in the form of carbon black, and may contain calcium carbide.
Desulphurization agents based on calcium carbide which contain substances which release water at the temperature of the molten metal, are already known from DE-B2-22 52 795.
These agents which are mixtures of commercially available carbide with, for example, Ca (OH) 2 as water-releasing substance and possibly carbon and calcium carbonate, have the disadvantage that they are mixtures produced by mechanical mixing, in which carbide particles are separated apart from Ca (OH) 2 - Particles are present, which leads to a higher consumption, uneven and violent gas reactions and a large spread with regard to the desulfurization effect when using these products, which makes a targeted use of these agents difficult.
the older, unpublished EP-A1-31 534 relates to a process for the production of desulfurizing agents with a content of 1-6% by weight of chemically bound water based on calcium oxide-containing calcium carbide for pig iron and steel melts, which is characterized in that that a calcium carbide-calcium oxide melt mixture with a CaO content of 20 to 80% by weight is first produced from lime and coke, which mixture is allowed to solidify into a block by allowing it to cool; that one, while the solidified block still has an average temperature of more than 400 ° C, breaks it down to grain sizes less than 150 mm and gives up on the crushed and still at least 400 ° C hot mixture calcium oxide in such an amount that the resulting mixture resulting total CaO content corresponds to the desired CaO content in the end product, then the mixture with intensive mixing and in the presence of air or nitrogen with a moisture content of 5 to 20 g / m 3 (at 1.013 bar and 273.15 K) Grind temperatures below 100 ° C to grain sizes smaller than 10
the end product When mixing with free carbon and carbonate, it is preferred to add such an amount that the end product contains 0.5 to 8% by weight of free carbon and 0.5 to 20% by weight of carbonates of calcium, magnesium or sodium. In addition, the end product preferably contains 1-6% by weight of chemically bound water. The intensive mixing and grinding is best carried out at 10-50 ° C.
a calcium carbide-calcium oxide starting melt mixture with a CaO content of 20 to 45% by weight which was obtained in a known manner from lime and coke by thermal means.
the process according to the invention and the process of EP-A2-19 086 have the further advantages that a specific Möller composition is not set in each case to produce the carbide melt and the Lime does not have to be finely ground to a certain grain size beforehand, but that a carbide block can be assumed whose C a C 2 : CaO weight ratio can fluctuate within a very wide range, ie can be practically arbitrary, and the lime also in coarse-grained form, for example in a grain size between 8 and 60 mm, can be used.
composition according to the invention is that present on the surface of each grain Ca (OH) 2 close to CaC 2, is set very early and uniformly in motion whereby the desulfurizing reaction. With comparable desulfurization results, smaller amounts of the desulfurization agent are required and more targeted results are possible.
the block After the block had cooled to an average temperature of about 600 ° C, it was pre-broken to grain sizes smaller than 150 mm and the carbide, which was still 500 ° G hot, was overlaid with so much lime with a grain size of 8 to 60 mm that the resulting mixture contained a total CaO content of 50% by weight.
850 kg of this mixture were mixed with 100 kg limestone (grain size less than 1 mm) and 50 kg of coke breeze (grain size less than 3 mm) and with passage of 1,500 m 3 / h of air with a moisture content of 10 g / m 3 (at 15 ° C) in a rotary mill with a throughput of 500 kg / h at 50 ° C to grain sizes between 0 and 0.1 mm.
the product obtained contained 2% by weight of chemically bound water.
Calcium carbide is produced thermally from lime and coke in a known manner, the lime-coke mixture in the entire Möller being adjusted to a weight ratio of approximately 110:40, which corresponds to a carbide with a CaO content of approximately 45% by weight.
CaO with a grain size of 3-8 mm is added to the tapping jet of this carbide in such an amount that an average content of approx. 80% by weight CaO results in the tapping crucible (approx. .
the block is pre-crushed to a grain size of less than 150 mm and as much lime with a grain size of 8 to 60 mm is layered on the hot mixture. That the average CaO content is 90% by weight.
875 kg of this mixture are mixed with 100 kg limestone (grain size less than 1 mm) and 25 kg of coke breeze (grain size less than 3 mm) and with passage of 1,500 m 3 / h of air with a moisture content of 10 g / m 3 (at 15 ° C) in a rotary mill with a throughput of 500 kg / h at 50 ° C to a grain size less than 0.1 mm.
the product obtained contains 2.5% by weight of chemically bound water.

Landscapes

Chemical & Material Sciences (AREA)
Engineering & Computer Science (AREA)
Materials Engineering (AREA)
Metallurgy (AREA)
Organic Chemistry (AREA)
Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Treatment Of Steel In Its Molten State (AREA)
Manufacture And Refinement Of Metals (AREA)
Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)

EP82101427A 1981-03-24 1982-02-25 Verfahren zur Herstellung von Entschwefelungsmitteln für Roheisen- oder Stahlschmelzen Expired EP0061011B1 (de)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
AT82101427T ATE9596T1 (de)	1981-03-24	1982-02-25	Verfahren zur herstellung von entschwefelungsmitteln fuer roheisen- oder stahlschmelzen.

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE3111509		1981-03-24
DE19813111509 DE3111509A1 (de)	1981-03-24	1981-03-24	Verfahren zur herstellung von entschwefelungsmitteln fuer roheisen- oder stahlschmelzen

Publications (2)

Publication Number	Publication Date
EP0061011A1 EP0061011A1 (de)	1982-09-29
EP0061011B1 true EP0061011B1 (de)	1984-09-26

Family

ID=6128139

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP82101427A Expired EP0061011B1 (de)	1981-03-24	1982-02-25	Verfahren zur Herstellung von Entschwefelungsmitteln für Roheisen- oder Stahlschmelzen

Country Status (10)

Country	Link
US (1)	US4400292A (es)
EP (1)	EP0061011B1 (es)
JP (1)	JPS57169010A (es)
AT (1)	ATE9596T1 (es)
BR (1)	BR8201618A (es)
CA (1)	CA1184384A (es)
DD (1)	DD202183A5 (es)
DE (2)	DE3111509A1 (es)
ES (1)	ES510769A0 (es)
ZA (1)	ZA821939B (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE3535280A1 (de) *	1985-10-03	1987-04-09	Hoechst Ag	Entschwefelungsgemisch fuer metallschmelzen, ein verfahren zu seiner herstellung und seine verwendung

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE1408188A1 (de) *	1959-12-19	1968-10-17	Hoesch Ag	Verfahren zur Entschwefelung von Roheisenbaedern
AT264560B (de) *	1966-08-25	1968-09-10	Gustav Dipl Ing Wolfram	Basisches Stahlherstellungsverfahren
DE2037758C3 (de) *	1970-07-30	1979-08-02	Hoechst Ag, 6000 Frankfurt	Verfahren zur Herstellung von CaIciumkarbid zur Entschwefelung von Metallschmelzen
LU63607A1 (es) *	1971-07-26	1973-02-05
DE2252795C3 (de) *	1972-10-27	1982-09-09	Skw Trostberg Ag, 8223 Trostberg	Entschwefelungsmittel für Roheisen- und Ferrolegierungsschmelzen
DE2326539C3 (de) *	1973-05-24	1975-11-13	Sueddeutsche Kalkstickstoff-Werke Ag, 8223 Trostberg	Verfahren zur Herstellung eines Entschwefelungsgemisches für Eisenschmelzen aus Calciumcarbid und mindestens einem wasserhaltigen Stoff
IT1047585B (it) *	1975-09-26	1980-10-20	Centro Speriment Metallurg	Perfezionamento alla disossidazione e desolforazione dell acciaio
DE2741588C2 (de) *	1977-09-15	1985-02-07	Skw Trostberg Ag, 8223 Trostberg	Mittel zum Entschwefeln von Eisenschmelzen
DE2919324A1 (de) *	1979-05-14	1980-12-04	Hoechst Ag	Entschweflungsmittel fuer roheisen- und stahlschmelzen sowie ein verfahren zu ihrer herstellung
DE2920353A1 (de) *	1979-05-19	1980-11-27	Hoechst Ag	Verfahren zur herstellung von entschweflungsmitteln fuer roheisen- oder stahlschmelzen
DE2952686A1 (de) *	1979-12-29	1981-07-02	Hoechst Ag, 6230 Frankfurt	Verfahren zur herstellung von entschwefelungsmitteln fuer roheisen- oder stahlschmelzen
ES497686A0 (es) *	1979-12-29	1981-11-01	Hoechst Ag	Procedimiento para la preparacion de un agente para la de- sulfuracion de masas fundidas metalicas

1981
- 1981-03-24 DE DE19813111509 patent/DE3111509A1/de not_active Withdrawn
1982
- 1982-02-25 AT AT82101427T patent/ATE9596T1/de active
- 1982-02-25 DE DE8282101427T patent/DE3260809D1/de not_active Expired
- 1982-02-25 EP EP82101427A patent/EP0061011B1/de not_active Expired
- 1982-03-16 CA CA000398465A patent/CA1184384A/en not_active Expired
- 1982-03-18 US US06/359,229 patent/US4400292A/en not_active Expired - Fee Related
- 1982-03-19 DD DD82238308A patent/DD202183A5/de unknown
- 1982-03-23 ZA ZA821939A patent/ZA821939B/xx unknown
- 1982-03-23 BR BR8201618A patent/BR8201618A/pt unknown
- 1982-03-24 ES ES510769A patent/ES510769A0/es active Granted
- 1982-03-24 JP JP57045746A patent/JPS57169010A/ja active Granted

Also Published As

Publication number	Publication date
CA1184384A (en)	1985-03-26
DE3111509A1 (de)	1982-10-07
US4400292A (en)	1983-08-23
ES8302104A1 (es)	1983-02-01
JPS57169010A (en)	1982-10-18
ZA821939B (en)	1983-02-23
JPH0135883B2 (es)	1989-07-27
ATE9596T1 (de)	1984-10-15
DE3260809D1 (en)	1984-10-31
ES510769A0 (es)	1983-02-01
BR8201618A (pt)	1983-02-08
DD202183A5 (de)	1983-08-31
EP0061011A1 (de)	1982-09-29

Publication	Publication Date	Title
EP0061012B1 (de)	1984-09-05	Verfahren zur Herstellung eines Entschwefelungsmittels für Roheisen- und Stahlschmelzen
EP0019086B1 (de)	1982-12-22	Verfahren zur Herstellung von Entschweflungsmitteln für Roheisen- oder Stahlschmelzen
DE2247497A1 (de)	1973-04-05	Verfahren zur gewinnung von kupfer, nickel, kobalt und molybdaen aus tiefseemanganknollen
EP0031534B1 (de)	1984-08-22	Verfahren zur Herstellung von Entschwefelungsmitteln für Roheisen-oder Stahlschmelzen
EP0031552B1 (de)	1984-11-21	Entschwefelungsmittel und Verfahren zu seiner Herstellung
EP0061011B1 (de)	1984-09-26	Verfahren zur Herstellung von Entschwefelungsmitteln für Roheisen- oder Stahlschmelzen
EP0220522B1 (de)	1989-12-13	Entschwefelungsgemisch für Metallschmelzen, ein Verfahren zu seiner Herstellung und seine Verwendung
DE2037758C3 (de)	1979-08-02	Verfahren zur Herstellung von CaIciumkarbid zur Entschwefelung von Metallschmelzen
EP0019087B1 (de)	1983-07-20	Entschweflungsmittel für Roheisen- und Stahlschmelzen sowie ein Verfahren zu ihrer Herstellung
DE2504026A1 (de)	1976-04-22	Verfahren zur behandlung von metallurgischen kraetzen und schlacken
DE2708424C2 (de)	1987-03-19	Verfahren zur Entschwefelung von Roheisenschmelzen
DE69700665T2 (de)	2000-05-11	Entschwefelnde kalzium-karbidmischung
DE2709062A1 (de)	1978-09-07	Mittel und verfahren zur entschwefelung von eisenschmelzen
DE2236160C3 (de)	1975-10-09	Mittel zur Entschwefelung von flüssigem Roheisen und Verfahren zu seiner Herstellung
EP0071101B1 (de)	1986-09-24	Verfahren zur Herstellung staubfreier, kalk- und phosphathaltiger Düngemittel
DE2952761A1 (de)	1982-01-28	Entschwefelungsmittel fuer roheisen- und stahlschmelzen sowie ein verfahren zu ihrer herstellung
DE2151394B2 (de)	1978-12-14	Verfahren zur Herstellung kaltgebundener Agglomerate aus partikelförmigem, mineralischem Konzentrat
DE835613C (de)	1952-04-03	Reinigungsmittel fuer Eisen- und Stahlschmelzen
WO2016096178A1 (de)	2016-06-23	MISCHUNG, VERWENDUNG DIESER MISCHUNG SOWIE VERFAHREN ZUR KONDITIONIERUNG EINER BEI DER EISEN- UND STAHLMETALLURGIE AUF EINER METALLSCHMELZE IN EINEM METALLURGISCHEN GEFÄß BEFINDLICHEN SCHLACKE
EP1007748A1 (de)	2000-06-14	Verfahren und anlage zum verarbeiten von eisen- und ölhältigen hüttenwerksreststoffen
DE3310329C2 (es)	1991-04-11
WO2001042159A1 (de)	2001-06-14	Verfahren zum zerkleinern von schlacken unter gleichzeitiger entschwefelung und nachfolgendem entchromen
DE2060927B2 (de)	1973-06-07	Verfahren zur herstellung eines granulierten thomas-phosphat-duengemittels
DE2705543A1 (de)	1977-09-01	Verfahren zur erzeugung von schlacken mit gesteigert loeslichem phosphatanteil
DE1433638A1 (de)	1969-10-09	Verfahren zur Herstellung von Roheisen mit niedrigem Phosphorgehalt

Legal Events

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1982-07-31	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
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1984-05-25	ITF	It: translation for a ep patent filed
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